U0197-Lost Communication With Hands Free Phone Module: Notes

Fig 1: U0197-Lost Communication With Hands Free Phone Module Diagram

Courtesy of DAIMLERCHRYSLER CORP.

For a complete wiring diagram Refer to  SYSTEM WIRING DIAGRAMS  . 

• When Monitored: 
  • With the ignition on
  • Battery voltage between 10 and 16 volts
  • IOD fuse installed
  • FCM is configured correctly
• Set Condition: 

  Bus messages not received from the HFM for approximately 2 to 5 seconds.

Possible Causes 

1. CAN B BUS CIRCUITS OPEN OR SHORTED
2. DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
3. FCM NOT CONFIGURED CORRECTLY
4. HANDS FREE MODULE
5. HANDS FREE MODULE POWER AND GROUND
6. MODULE THAT SET THIS DTC